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what does rapid hardening cement contain?


1. Tetra-calcium alumino-ferrite
2. Tri-calcium aluminates
3. Di-calcium silicate
4. Tri-calcium silicate

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Correct Answer - Option 4 : Tri-calcium silicate

Explanation:

Rapid Hardening Cement:

  • It is also called high early strength cement.
  • Contains a higher proportion of tri-calcium silicate (C3S)
  • Suitable for road repairing work and in structures where the load is applied in a short time
  • Unsuitable for mass concreting work, such as bridges, dams, etc.

Major compounds of cement clinker (also known as Bogues compounds) are:   

Bogues compounds

Properties

Tetra-calcium alumino-ferrite(C4AF)

  • Formed within 24 hours of the addition of water
  • The High heat of hydration in initial periods

Tri-calcium aluminates(C3A)

 

  • Formed in 24 hours of the addition of water
  • Max. evolution of heat of hydration
  • Reduce the setting time of cement

Di-calcium silicate(C2S)

 

  • Last compound formed during the hydration of cement
  • Responsible for progressive later stage strength
  • The Proportion of this increase in hydraulic structure, bridges etc.

Tri-calcium silicate(C3S)

 

  • Formed within a week
  • Responsible for initial strength of cement
  • Contribute about 50-60% in cement

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